I've wondered over the last week whether a strategy to fighting the perverse psychological changes that seem to settle in the minds of many police officers would be term limits? An "up or out" mentality like in the armed forces[1]?
It seems like many of the worst offenders have been mostly stagnant at their posts for many years - surely getting in fresh faces that have had a chance for more modern training would help break some of this mentality of "corps over country".
[1] https://en.wikipedia.org/wiki/Up_or_out